Combined gauge and grooving device for dowel pins and the like



Sept. 30, 1952 K. A. SPRINGER 2,612,193

COMBINED GAUGE AND GROOVING DEVICE FOR DOWEL PINS AND THE LIKE Filed Sept. 13, 1949 III-.-

II V V EN TOR.

Patented Sept. 30, 1952 UNITED". STATES PATENT o FicE COMBINED GAUGE 32K; i I 7 FOR DOWEL PINS AND THE LIKE 1 Karl A. Springer, lhiladelphia; .Pa. 1 I

Application September 13, 1949, Serial No. 115,414

2 Claims.

In carpentry and cabinet making, a dowel pin is used for joining two pieces of wood together and, in order to have a tight fit the dowel pin should just barely clear the opening into which it is inserted, and, for firm engagement, the dowel pin should have grooves or notches for receiving and holding a sufficient amount of glue.

To this end, it has heretofore been the practice to have a number of different diameter pins and, because such pins were smooth, it was the practice to groove or notch a pin when it was about to be used.

It is, therefore, the object of this invention to produce a portable tool which serves as combined gauge and grooving device whereby longitudinally grooved, pins, havin exactly the outside diameter desired, can be produced from any available stock,'with little skill or effort,

A further object of this invention is to produce a device of the character described whereby it is possible to reduce the number of different diameter pieces of stock it would be necessary to keep on hand.

A still further object is to produce a device of the type set forth which will be light, durable and inexpensive.

These and other objects are attained by my invention asset forth in the following specification and as shown in the accompanying drawings, in

which: t

Fig. 1 is a top plan view of a combined gauge and grooving device embodying my invention.

Fig. 2 is a section taken on line IIII on Fig. 1.

Fig. 3 is an enlarged section taken on line III-III on Fig. 1.

Fig. 4 is an end elevational view of a dowel pin grooved by the device of my invention.

The device illustrated includes an upper guide and gauge member In and a lower grooving mem ber I2, which are detachably connected or assembled by screws I4. Theupper member I is preferably formed of spaced inner and outer plates I6 and I8, having overlapping flanges and 22 which form a reinforced box-like structure.

The lower member I2 is preferably formed of an intermediate plate 24, a bottom plate 26 and a top clamping plate 28. The bottom plate 26 is provided with flanges 38, which snugly engage the longitudinal edges of the plates 24 and 28. The upper and lower members are spaced apart by bushings 32 through which the assembly screws I4 pass as best shown in Fig. 2.

The plates I6, I8, 24 and 28 are provided with a number of registering openings 34 of different predetermined sizes. For example, the openings 34 may be graduated from s to of an inch or from to one inch and so forth and suitable indicia is inscribed near each opening in top plate I8 to indicate the size of the particular opening.

The intermediate plate 24 is provided with openings which register with and are of the same size as the openings 34 in the other plates except that the openings are provided with teeth 38 for cutting longitudinal grooves in initially smooth dowel pins.

With the device assembled as shown in Fig. 2, the operator takes a piece of stock which is preferably round and which is close as possible to the size of the finished product and passes the end of the stock through openings 34 in plates I6, I8 and 28 until the end of the stock rests against the teeth 38. Pressure is now applied to the stock to force it through the opening in plate 26 and through opening 34 in plate 24. Upon emerging, the initially smooth piece of stock will be grooved as shown in Fig. 4.

It will be seen that the device is composed of plates which are easily and inexpensively made, that the device is light and durable and that it can be used for sizing and grooving a number of different diameter pieces of stock.

If desired the device can be made of one piece by casting a relatively thick plate and forming a guide opening near one face thereof and a toothed opening near the other face thereof so that a piece of stock to be grooved can be inserted through the guide opening and forced through the toothed opening.

What I claim is:

1. A portable, combined dowel gauging and grooving device includin a first plate having a toothed opening of a fixed predetermined size formed therein, a second plate having a guide opening formed therein of the same size as said toothed opening, there being a through opening in one of said plates and a tapped hole in the other of said plates, a spacer between said plates and a screw passing through said opening and engaging said tapped hole for securing said plates together with said guide openin in registration with said toothed opening.

, 2. A portable, combined dowel gauging and grooving device including a gauging member and a grooving member, said gauging member comprising a first outer plate having peripheral flanges and a first inner plate nested within, and secured to said first outer plate by, said flanges, said grooving member comprising a second outer plate having peripheral flanges and a second in- 3 her plate seated within, and secured to said second outer plate by, said flanges, each of said first outer and inner plates and said second outer plate having an opening formed therein of the same fixed, predetermined size as, and in registration with, the openings in the other two of said plates, and said second inner plate having a toothed opening formed therein of the same size as, and in registration with, the openings in the other, previously mentioned plates, bushings intermediate said first and second inner plates, and screws passing through one of said inner plates and through said bushings and engaging the other said inner plates to secure said gauging and grooving members in spaced relation to each other.

KARL A. SPRINGER.

Number REFERENCES CITED UNITED STATES PATENTS Name Date Stewart he. Sept. 2, 1890 can May 1, 1928 Caron s- 

